package com.xxxx.server.config;

import com.xxxx.server.util.JwtTokenUtil;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.simp.config.ChannelRegistration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.messaging.simp.stomp.StompCommand;
import org.springframework.messaging.simp.stomp.StompHeaderAccessor;
import org.springframework.messaging.support.ChannelInterceptor;
import org.springframework.messaging.support.MessageHeaderAccessor;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;
import sun.plugin.liveconnect.SecurityContextHelper;

/**
 * @Desc
 * @Author lsh
 * @Create Time 2020/12/25 21:17
 */
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {

    @Value("${jwt.tokenHead}")
    private String tokenHead;
    @Autowired
    private JwtTokenUtil jwtTokenUtil;
    @Autowired
    private UserDetailsService userDetailsService;

    /**
     * 在网页可以通过websocket连接上服务
     * 配置服务地址，制定是否使用socketJS
     * @param registry
     */
    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        /**
         * 将ws/ep路径注册为stomp端点，用户连接了这个端点就可以进行websocket通信，支持socketJS
         * 允许跨域
         * 支持socketJS访问
         */
        registry.addEndpoint("/ws/ep").setAllowedOrigins("*").withSockJS();
    }

    /**
     * 输入通道参数配置
     * @param registration
     */
    @Override
    public void configureClientInboundChannel(ChannelRegistration registration) {
        registration.interceptors(new ChannelInterceptor() {
            @Override
            public Message<?> preSend(Message<?> message, MessageChannel channel) {
                StompHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, StompHeaderAccessor.class);
                //判断是否是链接
                if (StompCommand.CONNECT.equals(accessor.getCommand())) {
                    String token = accessor.getFirstNativeHeader("Auth-Token");
                    if (!StringUtils.isBlank(token)){

                        String authToken = token.substring(tokenHead.length());
                        String username = jwtTokenUtil.getUserNameFormToken(authToken);
                        if (!StringUtils.isBlank(username)){
                            //登录
                            UserDetails userDetails = userDetailsService.loadUserByUsername(username);
                            //验证token是否有效
                            if (jwtTokenUtil.validateToken(authToken,userDetails)){
                                UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(
                                        userDetails, null, userDetails.getAuthorities());
                                SecurityContextHolder.getContext().setAuthentication(authenticationToken);
                                accessor.setUser(authenticationToken);
                            }

                        }
                    }
                }
                return message;
            }
        });
    }

    /**
     * 配置消息代理
     * @param registry
     */
    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
        //配置代理，可多个，配置代理目的地前缀为/queue,可以配置域上向客户端推送消息
        registry.enableSimpleBroker("/queue");
    }
}
